i got mine done on Tildin dr off battlefield. road is next to where the goodwill used to be. its on the left in a row of shops. chesapeake calibration. i do have to say though, he didnt knock me down as much as i was told he did for other people, i had 67/45 he marked me as it being 4 off, so 64/45. and in the end he didnt actually calibrate it because he said its dead on. if it was dead on why does my speedo show my doing 70 in the right lane in moderate traffic. no way them people are doing 70.